Home / Materials / Lastobond Smooth Seal HT FR self-adhering SBS modified bitumen underlayment

Lastobond Smooth Seal HT FR self-adhering SBS modified bitumen underlayment

Name: Lastobond Smooth Seal HT FR self-adhering SBS modified bitumen underlayment
Brand: Soprema Inc.

This is a listed roofing assembly. Listing 8180-2364:0001. This site cites astm-e108-ul-790. Match the model and orientation. A listing is not a permit.

Soprema Inc. listing 8180-2364:0001 in OSFM category 8180. Lastobond Smooth Seal HT FR self-adhering SBS modified bitumen underlayment. Refer to listee's data sheet and UL Roofing Systems Directory for detailed product description and operational considerations.

Kind: listed-assembly. Brand: Soprema Inc.. Listing evidence: OSFM WUI handbook 2026-08-25. Page reviewed 2026-08-26. JSON (CC BY 4.0)

Documented attributes

Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.

Attribute	Value	Evidence source
Assembly role	roof underlayment	CAL FIRE OSFM Building Materials Listing — 8180-2364:0001 (official-listing · Listing 8180-2364:0001, Description field)

Program	ID / source	Evidence date	Expires	Status
CAL FIRE BML	8180-2364:0001 · Search BML for 8180-2364:0001	2026-08-25	2027-06-30	listed

Tests and programs cited

ASTM E108 / UL 790 · test-method
OSFM BML · listing-program

Listing is from the OSFM WUI handbook. Confirm the live GOVmotus record and the exact model before specification.
OSFM listing is not a permit. The authority having jurisdiction decides.

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Sources

2025 OSFM WUI Listed Products Handbook (2 September 2025) — CAL FIRE OSFM (official). Accessed 2026-08-23.
OSFM Building Materials Listing search — CAL FIRE OSFM (listing-body). Accessed 2026-08-23.

Lastobond Smooth Seal HT FR self-adhering SBS modified bitumen underlayment. FireApproved. https://fireapproved.com/materials/soprema-inc-lastobond-smooth-seal-ht-fr-self-adhering-sbs-modified/. Last verified 2026-08-26.